Rein 166-500-10-91 Coolant Breather Pipe Expansion Tank to Radiator Overflow Hose

The Rein 166-500-10-91 Coolant Breather Pipe is a direct-fit OE-quality replacement hose that connects the coolant expansion tank to the radiator, allowing air to vent from the cooling system and coolant to circulate properly. Also known as a radiator overflow hose or coolant recovery line, this component is essential for maintaining correct coolant levels and preventing engine overheating.

Key Features:

• Direct OE replacement for the factory coolant breather pipe / radiator overflow hose
• Constructed from durable plastic and rubber materials engineered to withstand the demanding heat and pressure conditions of the engine compartment
• Manufactured to OE specifications for correct fit, form, and function
• Connects the coolant expansion tank to the radiator for proper system venting and coolant recovery
• Sold as a single unit — includes 1x coolant breather pipe assembly

OEM Cross-Reference: 166 500 10 91 / 1665001091 / A1665001091 / 166-500-02-91

Rein Automotive is a trusted brand under CRP Automotive, offering a comprehensive line of OE-quality European vehicle replacement hoses and components. This coolant breather pipe is the correct, confidence-inspiring replacement to restore proper cooling system operation.